Which product of the following reactions fails to give the carbylamine test?

Consider the following sequence of reactions: $C_2H_5-Br$ $\xrightarrow{AgCN} A$ $\xrightarrow{H_2/Ni} B$. Product $B$ is:

$A$ solution contains $1 \ g \ mol$ each of $p-$toluene diazonium chloride and $p-$nitrophenyl diazonium chloride. To this,$1 \ g \ mol$ of alkaline solution of phenol is added. Predict the major product and explain your answer.

The end product of the reaction $C_2H_5NH_2$ $\xrightarrow{HNO_2} A$ $\xrightarrow{PCl_5} B$ $\xrightarrow{KCN} C$ is

$A$ reaction of $0.1 \ mol$ of Benzylamine with bromomethane gave $23 \ g$ of Benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed in this reaction are $n \times 10^{-1},$ when $n = \dots$ (Round off to the Nearest Integer).
(Given : Atomic masses: $C : 12.0 \ u, H : 1.0 \ u, N : 14.0 \ u, Br : 80.0 \ u$)

The major product obtained in the reaction of aniline with acetic anhydride is